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Trey sent this to me, very useful service for trolling through on line courses for new things to do. I just finished my first Coursera class, and enjoyed the experience very much. The quality of the material was extremely high, and the cost was extremely low (zero). Absolutely worth the time commitment. Others in the class not so happy, as they disliked the peer review grading system. But, to me it was easy to ignore low value peer input when the material was so high quality and some of the peer review input was very valuable.